Multiple stroke radial piston motor with radially extending guide segments on the rotor and with four rollers carried by each stroke transfer body

Abstract

The former art provides multi-stroke hydrostatic motors, which perform at a single revolution of the rotor multiple inward and outward strokes of the pistons. A high torque was thereby obtained. The invention discovers, that the know multi-stroke motors have still relatively short piston strokes in relation to the diameter of the rotor. The invention increases the efficiency of multiple stroke motors by the provision of control communications to control the flow of fluid pressure into pockets open to the piston faces and cylinder walls, whereby the torque of the rotor is transferred from the pistons to the cylinder walls by high pressure fluid in the pockets. The invention also provides radial guide extensions to enlarge the stroke of the pistons in a given size and weight of the device combined with the partial movement of the pockets along the guide extensions.

What is claimed, is: 
     
       1. In a radial piston device, in combination; a housing, a rotor rotatably mounted in said housing, at least a pair of working chambers which are substantially parallel to each other and laterally distanced from the axis of the said rotor, with said chambers provided in said rotor, at least a pair of pistons reciprocable in said working chambers and along wall faces of said working chambers, inlet channels and oulet channels communicated to said chambers and to said housing, a stroke guide provided in said housing and radially of said chambers and pistons for the guidance of the strokes of said pistons, stroke transfer bodies mounted between said pistons and said stroke guide, control means for the control of flow of fluid to and from said working chambers, and multiple inward and outward guide faces on said stroke guide to guide said reciprocable pistons a plurality of times inward and outward in said chambers along said wall faces at each revolution when said rotor revolves, radial extensions on said rotor extending radially outwards from said chambers to provide extended guide lengths for the guidance of said pistons, fluid pressure pockets provided in the direction of the lateral loads of said pistons with said fluid pressure pockets located between peripheral outer portions of said pistons and said wall faces, control portions provided to said pistons to control the flow of fluid into sid pockets with said control portions acting in timed relation to the move of said transfer bodies along said outward and inward guide faces of said stroke guide, said stroke guide including a medial portion and end portions on the axial ends of said medial portion with said guide faces provided on said end portions, wherein said medial portion provides a recess which extends beyond said guide faces radially into said stroke guide,   wherein said radial extensions of said rotor at least temporarily extend into said recess in said stroke guide,   wherein said transfer bodies have medial parts and end parts on the axial ends of said medial portion,   wherein said medial parts include power transfer centers,   wherein said power transfer centers are located in said pistons and at the major portions of the strokes of said pistons between said radial extensions of said rotor,   wherein said end parts of said transfer bodies carry bearing portions to engage said guide faces and to guide said transfer bodies and said pistons substantially parallel to said outward and inward guide faces of said stroke guide,   wherein said stroke transfer bodies carry on said end parts and axially endwards of said pistons peripherally distanced roller pairs, which form said bearing portions,   whereon said medial parts of said transfer bodies are pivotably borne in bearing beds of said pistons,   wherein said roller pairs roll along said guide faces, whereby said transfer bodies pivot in said beds when the axes of said roller pairs move substantially parallel along said guide faces, and,   wherein said roller pairs form by each of said pairs a peripherally forwardly located and a peripherially rearwardly located roller for the maintenance of stable guidance of said transfer bodies along said guide faces.   
     
     
       2. The device of claim 1 wherein said stroke transfer extend axially in both directions beyond said pistons, to form stroke transfer ends, wherein said ends form pairs of said bearing portions, while said bearing portions of each pair form one forwardly located bearing portion and one rearwardly located bearing portion, and each of said bearing portions carries a rolling member, whereby four rolling members associated to each respective piston and transfer body are rolling along pairs of inward and outward guide faces of said stroke guide in order to define by said rolling under the influence of the configuration of said guide faces of said stroke guide the inclination of pivotion of said transfer bodies and thereby provide and control said flow of fluid into said pockets and said action in said timed relation of said control portions.